Daily Sunspot Evaluation
Observation Sheet Thursday, 18 December 1958
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 5
- Number of spots (f)
- 36
- Relative number (R)
- 86
- Observer
- FY
- Reading
- all checks consistent
- File
- 19581218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | 20 | 65E | ||||
| 2 | D – 11 | -15 | 41E | ||||
| 3 | A – 2 | -20 | 38W | ||||
| 4 | J – 5 | 6 | 44W | ||||
| 5 | E – 15 | 22 | 18W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.